body {
    font-family: 'Montserrat', sans-serif;
    margin: 0;
    padding: 0;
    height: 100vh;
    background-color: black;
    background: url('bg.png') no-repeat center center fixed;
    background-size: cover;
    color: white;
}
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.1);
    z-index: -1;
}
.nav {
    width: 100%;
    display: flex;
    justify-content: center;
    background-color: rgba(0, 0, 0, 0.7);
    padding: 10px 0;
    position: absolute;
    top: 0;
}
.nav a {
    color: white;
    text-decoration: none;
    padding: 10px 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
    transition: background-color 0.3s, color 0.3s;
}
.nav a:hover {
    background-color: white;
    color: black;
}
.btn {
    display: inline-block;
    margin: 20px 0 0 20px;
    padding: 10px 20px;
    border: 2px solid white;
    color: white;
    text-decoration: none;
    font-size: 1rem;
    transition: background-color 0.3s, color 0.3s;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
    box-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
}
.btn:hover {
    background-color: white;
    color: black;
}